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Analysing the Large-scale Debris Flow Event in July 2022 in Horlachtal, Austria Using Remote Sensing and Measurement Data

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Rom, Jakob ; Haas, Florian ; Hofmeister, Florentin ; Fleischer, Fabian ; Altmann, Moritz ; Pfeiffer, Madlene ; Heckmann, Tobias ; Becht, Michael:
Analysing the Large-scale Debris Flow Event in July 2022 in Horlachtal, Austria Using Remote Sensing and Measurement Data.
In: Geosciences. 13 (2023) 4: 100.

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Volltext Link zum Volltext (externe URL):
https://doi.org/10.3390/geosciences13040100

Kurzfassung/Abstract

High-quality in situ measurements are essential for hazard assessment of debris flow events. However, precise data on debris flow triggering thresholds, accumulation volumes and spatial characteristics of large-scale events on catchment scale are scarce due to the rare occurrence of debris flows and the challenges of acquiring accurate data for a larger area. In this study, we present quantitative analyses of a single extreme debris flow event in the Horlachtal, Austria, triggered by local high-intensity short-duration precipitation events on 20 and 23 July 2022. Pre- and post-event airborne LiDAR (light detection and ranging) data with a high spatial resolution reveal that 156 different debris flow processes were initiated during these events, with accumulation volumes of up to approximately 40,000 m³. The calculated debris flow deposition volumes also show a power-law relationship with the total amount of rainfall in the respective debris flow catchments. The spatial appearance of the debris flows shows a concentration of processes in a particular area rather than a uniform distribution, suggesting a local nature of the triggering event. This is further supported by the measurements from three meteorological stations and four discharge gauges within the study area. The gridded area-wide INCA (Integrated Nowcasting through Comprehensive Analysis) rainfall data further point to a local convective event on 20 July 2022, with a maximum rainfall intensity of 44 mm/h.

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Publikationsform:Artikel
Schlagwörter:debris flows; precipitation event; Austrian Alps; Horlachtal; LiDAR
Sprache des Eintrags:Englisch
Institutionen der Universität:Mathematisch-Geographische Fakultät > Geographie > Lehrstuhl für Physische Geographie
DOI / URN / ID:10.3390/geosciences13040100
Open Access: Freie Zugänglichkeit des Volltexts?:Ja
Peer-Review-Journal:Ja
Titel an der KU entstanden:Ja
KU.edoc-ID:31899
Eingestellt am: 27. Mär 2023 10:29
Letzte Änderung: 27. Mär 2023 10:29
URL zu dieser Anzeige: https://edoc.ku.de/id/eprint/31899/
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